BIBO stability and stabilization of networked control systems with short time-varying delays

This paper presents a robust control approach to solve the stability and stabilization problems for networked control systems (NCSs) with short time-varying delays. A new discrete-time linear uncertain system model is proposed to describe the NCS, and the uncertainty of the network-induced delay is transformed into the uncertainty of the system matrix. Based on the obtained uncertain system model, a sufficient BIBO stability condition for the closed-loop NCS is derived by applying the small gain theorem. The obtained stability condition establishes a quantitative relation between the BIBO stability of the closed-loop NCS and two delay parameters, namely, the delay upper bound and the delay variation range bound. Moreover, design procedures for the state feedback stabilizing controllers are also presented. An illustrative example is provided to demonstrate the effectiveness of the proposed method. Copyright 2010 John Wiley & Sons, Ltd.